Mechanically-operated grate for furnaces.



l V/ TNESSEJ v W. R. WOOD. MECHAMCALLY OPERATED GRATE FOR FURNACES. APPLICATION FILED NOV. 28, 1914.

Patented June 1, 1915.

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Application filed November 28, 119%. form! l lo. hllhhdf.

To all whom it may concern .2

Be it known that l, WILFJRED Ro'rnunr Woon a citizen of the United States of America, and a resident of London, England, have invented certain new and useful Improvements in and Connected with Mechanically-Operated Grates for Furnaces,of which the following is a specification.

This invention relates to that class of furnace grate in which reciprocating movement is imparted to the rate bars for the pur ose of breaking up t e fuel mass and fee ing same forward to the point of discharge.

The invention is herein described and illustrated as applied to that form of underfeed or mechanical stokers described in prior specification No. 818010, dated April l7th, 1906, but the present improvements can obviously be applied to other forms of furnaces in which the fuel is fed on at one end of the grate bars and discharged at the other ends some or all of such bars he- 7 ing reciprocated.

The accompanying drawing shows partly in elevation and partly in section a furnace grate such as illustrated particularly in'l ig ure 6 of said prior specification, but with the present improvements applied thereto and the same figures of reference are employed in both sets of drawings.

In the drawings accompan ing the present application the usual fee hopper 1 delivers the fuel to the fuel magazine or retort 5 along and up to which it is fed in the well blown manner on the bottom 17,

and passes on to the grate bars 1d where final combustion takes place, the ash and clinker being eventually delivered to the dumping plate or grate 20.

To assist the feed down bars. l t and also to prevent the fuel caking thereon alternate bars 14 are preferably reciprocated and also givena sli ht rising and falling motion and this may under side of t e grate bars the roclming hairs being operated by guide pieces or nuts 12 andwspi ral feathers or progections 22 moved in'unison with the fuel feed as described in my prior specification, but according to the present invention the outer end of the movable bars It also has a rising and falling movement as it reciprocates on theinclined top 24 of the supporting bar 23vall as more fully hereinafter set forth. The air to supe obtained by rocking bars 13 adapted to on age with notches 15 on the port combustion passes from draft box 18 up to the retort 5 and also down the hollow grate bars 14 to ash pit l9 and up throu h the dumping plates 20, as indicated by t e arrows.

The details of the present invention and points of difi'erence from those described in my prior specification will now he set forth.

Tn the prior specification it will he noted that the outer end of the moving hollow grate bar 14 is substantially above the level of the dumping grate and reciprocates in a practically horizontal plane on the bar or frame carrying the trunnions of the dumpinggrate 20 and that the flowofair down grate bar 14 is somewhat impeded when its discharge opening is resting upon the solid portions of such bar or dumping'grate and also that even if the inner end of graterhar 14 be slightly raised during reciprocation by the rockln bar 13 still the outer end of 14L will practically have only a horizontal reciprocating movement and while this is sufficient with certain classes of fuel ash and cinder yet with others better results can be attained if the mass is somewhat raised as it is forced forward and also better results tit are attained if there is always a free flow Y for the draft through the grate bars ll into the ash pit 19 and u through the dumping grates 20 without sue draft being restricte point.

According to the present invention the top of the supporting bar 23 is inclined upwardly at Mine is also the underside of the closed outer end of grate bar 14; the construction being such that as the bar '14: is reciprocated its outer end has a rising and falhng movement over the inner end of dumping grate 20 thus breaking up and at the same time feeding forward the ash and clinker, and also the air from the draft box 18 alwavs has a free discharge through the grate bars 14 into the ash pit 19 at points behind the supporting bar 23 Further by tapering oil such bar l-l it is possible to bring its outer end almost in line -with the top face of the dump --plate 20 so that burnlllltl ing away at this point 1s substantially retarded, and this end is greatly assisted by making the extreme outer end of bars 14 solid wedge shaped in cross section and placing the draft opening farther back in the lower face of said bars. A further improved feature is adapting the dumping grate 20 so that when in its normal closed position it will be practically in the same plane as the top of bar 14 and preferably at approximately the same inclination: This will enable such dumping grate to receive and deal With a larger quantity ofash and cinder without clogging than when such grate is horizontal.

arious means may be employed to feed the fuel to the furnace and to cause the grate bars of such furnace to reciprocate,

and itis not deemed necessary to describe them in detail as other means than those indicated of fuel feeding and for causing the bars of various shapes to reciprocate can be employed, but the construction indicated in the drawings and described in prior United States specification No. 818010 is effective for the purpose.

at I claim is 1. In furnace grates of the class having hollow reciprocating gratehars. of box likecross section adapted to carry the draft and in combination, means for reciprocating the ars, a substantially wedge shaped outer end to the movable bars, a supporting bar having an upwardly inclined surface forming a support for the lower face of the 1 wedge shaped end of themovable bar so that a rising and falling movement is produced as the bar reciprocates, and a dump plate over the inner edge of which the movable bars can reciprocate.

2. In furnace grates of the class having hollow reciprocating grate bars of box like cross section adapted to carry the draft and in combination, means for'reciprocating the bars, a substantially wedge shaped outer end to the movable bars, a supporting bar having an upwardly inclined surface forming a support for the lower face of the wedge cross section adapted to carrythe draft and 1n combination, means for reciprocating the bars, a substantially wedge shaped outer end to the movable bars, a supporting bar having an upwardly inclined surface forming a support for the lower face of the wedge shaped end of the movable bar so that a rising and falling movement is produced as the bar reciprocates, a draft opening from the hollow bar on the furnace side of said supporting bar and a dump plate over the inner edge of which the movable bars can reciprocate.

4. In furnace grates of the class having hollow reciprocating grate bars of box like cross section adapted to carry the draft and in combination. means for reciprocating the bars, a substantially wedge shaped outer end to the movable bars. a supporting bar having an upwardly inclined surface forming a support for the lower face of the Wedge shaped end of the movable bar so that a rising and falling movement is producedas the bar reciprocates, a draft opening from the hollow bar on the furnace side of said supporting bar, a dump plate over the inner edge of which the movable bars can reciprocate, the top surface of said dump plate being placed practically in the same plane as the top surface of the bars and approximately at the same inclination.

In testimony whereof I have hereunto set my hand in the presence of two subscribing wltne.

WILFRED ROTHERY WOOD.

Witnesses:

O. J. WORTH, H. D. Jameson. 

